I am looking to buy a 1.8 a4 from a local small car lot. It's an 04 and has 78,000 miles. It has not had the the timing belt replaced yet. I can get the car for $5,000. What kind of price am I looking at to replace the timing belt? Anything else I should factor in before I buy it? It's for our 16 year old son.

Thanks for the help